MEMS High-G Shock AccelerometersState-of-the-Art MEMS Design and Fabrication

Highlights

Series 3991 MEMS high-amplitude shock accelerometers from PCB Piezotronics (PCB®),represent state-of-the-art industry technology for miniature, high amplitude, DC responseacceleration sensors. Tis series is capable of measuring long duration transient motion, aswell as, responding to and surviving extremely fast rise times, typical of a high-G shockevent. Both a packaged and an OEM configuration are offered, to fulfill a variety ofinstallation requirements.

The air-damped acceleration sensing element, is micromachined from silicon, ismanufactured with the latest advances in etching techniques and equipment. This tinyelement measures just 2.5 x 1.7 x 0.9 mm (L x W x H), and incorporates a seismic mass,protective over-range stops and a full-active, piezoresistive Wheatstone bridge.

Series 3991 is intended to fulfill the most demanding aerospace and defense applicationrequirements. Their design concepts were born from more than 20 years of PCB® expertisein very high-G shock (≥ 20,000 G) measurement applications and sensor development. Ourdesign team has the most experience in the world for these applications. Our processengineers utilized the latest and most sophisticated techniques and equipment to achievethe desired performance levels that previously have not been attainable.

As with all PCB® instrumentation, these sensors are complemented with toll-freeapplications assistance, 24-hour customer service and are backed by ourTotal Customer Satisfaction no risk policy.

Series 3991/ITAR

n Standard footprint – drop-in replacement for competitive models

n Titanium housing and OEM configurationavailable

n No zero-shift

n Slight damping reduces resonanceamplification

n Mechanical over-range stops improvesurvivability

n 20 KG and 60 KG ranges available

n Wide band frequency response

n Low power consumption

n Low warm-up drift

PCB Piezotronics Inc. Toll-Free in USA 866-816-8892 716-684-0001 www.pcb.com

Series 3991MEMS High-G

Shock Accelerometer

Applications

n Safe and Arm n Smart Fuzes n Penetrator Tests n Weapons Data Recorders / Launch

Characteristics n Explosive Environments (pyroshock) n Metal-to-metal Impact / Armor Piercing n Blast Loading of Structures / Nuclear

Blast Survivability

SERIES 3991/ITAR MEMS HIGH-G SHOCK ACCELEROMETERS

MEMS High-Amplitude Shock Accelerometers

This product is a controlled item under theInternational Traffic in Arms Regulations(ITAR), administered by the Office of DefenseTrade Controls.  Any export of this productfrom the United States, including any item inwhich this product may be incorporated,requires appropriate authorization from theU.S. State Department. Diversion contrary toU.S. law is prohibited.

MEMS High-Amplitude Shock Accelerometers

Model Number 3991A112KG 3991A1120KG 3991A1160KG 3991A1020KG 3991A1060KG 3991A3020KG 3991A3060KG

Sensitivity (10VDC excitation) 0.020 mv/g 0.010 mv/g 0.003 mV/g 0.010 mv/g 0.003 mV/g 0.010 mv/g 0.003 mV/g

Sensitivity 0.02 mV/V/g 0.001 mV/V/g 0.0003 mV/V/g 0.001 mV/V/g 0.0003 mV/V/g 0.001 mV/V/g 0.0003 mV/V/g

Measurement Range ± 0 to 2000 g ± 0 to 20,000 g ± 0 to 60,000 g ± 0 to 20,000 g ± 0 to 60,000 g ± 0 to 20,000 g ± 0 to 60,000 g

Frequency Range (± 1 db) 10 kHz 10 kHz 20 kHz 10 kHz 20 kHz 10 kHz 20 kHz

Resonant Frequency > 20k Hz > 60k Hz >120k Hz > 60k Hz >120k Hz > 60k Hz >120k Hz

Overload Limit (Shock) ± 10,000 g pk ± 60,000 g pk ± 100,000 g pk ± 60,000 g pk ± 100,000 g pk ± 60,000 g pk ± 100,000 g pk

Overload Limit (Mechanical Stops) ≥ 2.2 kg ≥ 30 kg ≥ 80 kg ≥ 30 kg ≥ 80 kg ≥ 30 kg ≥ 80 kg

Temperature Range(Operating)

-65 to +250 ºF-54 to +121 ºC

-65 to +250 ºF-54 to +121 ºC

-65 to +250 ºF-54 to +121 ºC

-65 to +250 ºF-54 to +121 ºC

-65 to +250 ºF-54 to +121 ºC

-65 to +250 ºF-54 to +121 ºC

-65 to +250 ºF-54 to +121 ºC

Excitation Voltage (Typical) 10 VDC 10 VDC 10 VDC 10 VDC 10 VDC 10 VDC 10 VDC

Excitation Voltage 3.3 to 15 VDC 3.3 to 15 VDC 3.3 to 15 VDC 3.3 to 15 VDC 3.3 to 15 VDC 3.3 to 15 VDC 3.3 to 15 VDC

Bridge Resistance (± 2k ohms) 2k ohms 6k ohms 6k ohms 6k ohms 6k ohms 6k ohms 6k ohms

Physical

Size (Height x Length x Width) 0.11 x 0.56 x 0.28 in (2.79 x 14.22 x 7.11 mm)

0.11 x 0.56 x 0.28 in (2.79 x 14.22 x 7.11 mm)

0.11 x 0.56 x 0.28 in (2.79 x 14.22 x 7.11 mm)

0.11 x 0.56 x 0.28 in (2.79 x 14.22 x 7.11 mm)

0.11 x 0.56 x 0.28 in (2.79 x 14.22 x 7.11 mm)

0.052 x 0.170 x 0.160 in (1.32 x 4.32 x 4.06 mm)

0.052 x 0.170 x 0.160 in (1.32 x 4.32 x 4.06 mm)

Weight 0.045 oz1.28 gm

0.045 oz1.28 gm

0.045 oz1.28 gm

0.045 oz1.28 gm

0.045 oz1.28 gm

0.0013 oz0.04 gm

0.0013 oz0.04 gm

Mounting (2) Through-holes /Screws

(2) Through-holes /Screws

(2) Through-holes /Screws

(2) Through-holes /Screws

(2) Through-holes /Screws Adhesive Mount Adhesive Mount

Housing Titanium Titanium Titanium Titanium Titanium Substrate Substrate

Cable Length 10 ft3 m

10 ft3 m

10 ft3 m

3 ft0.91 m

3 ft0.91 m N/A N/A

Electrical Connection 034 FEP, Integral Cable 034 FEP, Integral Cable 034 FEP, Integral Cable 094 Aramid, IntegralCable

094 Aramid, IntegralCable N/A N/A

Cable Termination Pigtails Pigtails Pigtails Pigtails Pigtails N/A N/A

Supplied Accessories

Mounting Screw (2) Model 081A110 (4-40 x 1/4" SHCS)

(2) Model 081A110 (4-40 x 1/4" SHCS)

(2) Model 081A110 (4-40 x 1/4" SHCS)

(2) Model 081A110 (4-40 x 1/4" SHCS)

(2) Model 081A110 (4-40 x 1/4" SHCS) N/A N/A

Calibration Certificate ACS-62 ShockCalibration

ACS-62 ShockCalibration

ACS-62 ShockCalibration

ACS-62 ShockCalibration

ACS-62 ShockCalibration

ACS-62 ShockCalibration

ACS-62 ShockCalibration

SERIES 3991/ITAR MEMS HIGH-G SHOCK ACCELEROMETERS

Model Numbering System for Series 3991 High-Amplitude Shock Accelerometers

1) Single Axis Series 3991

3991A Single axis, MEMS DC response shock accelerometer (revision A)

2) Configurations

101130

Titanium housing, 3 ft (0.9 m) integral cable, 4-conductor Aramid cable, terminating pigtails, two through-bolt mounting holesTitanium housing, 10 ft (3m) integral cable, 4 conductor FEP cable, terminating in pigtails, two through-bolt mounting holesSubstrate package, adhesive mount with solder tabs for electrical hook up, (internal component to Model 3991A1020KG and 3991A1120KG)

3) Measurement Range

20KG60KG

±20,000 G±60,000 G

4) Integral Cable Length (add only if selecting integral cable and other than standard length shown above)

/ XXX Specify XXX as desired in feet

5) Cable Termination (add only if selecting integral cable with other than pigtail connection

LN Mini 8-pin DIN connector

AY4-pin plug

Examples

3991A 10 20KGSingle axis, titanium housing, 3 ft (0.9m) integral cable, 4 conductor Aramid cable, terminating in pigtails,20,000 G range

3991A 11 60KG /020 LNSingle axis, titanium housing, integral 4 conductor FEP cable, 60,000 G range with 20 ft (6.1m) cableterminating with Mini 8-Pin DIN connector

Model 080A213 LN Mini 8-Pin DIN Connector

Triaxial mounting block for Models3991A10X0KG and 3991A11X0KG

(Screw 080A110)

Bridge input mating connector

(ITAR Controlled)

SERIES 3991/ITAR SIGNAL CONDITIONING

3425 Walden Avenue, Depew, NY 14043-2495 USAToll-Free in USA 866-816-8892

24-hour SensorLineSM 716-684-0001 Fax 716-684-0987 E-mail aerosales@pcb.com

www.pcb.comAS9100 CERTIFIED n ISO 9001 CERTIFIED n A2LA ACCREDITED to ISO 17025

© 2013 PCB Group, Inc. In the interest of constant product improvement, specifications are subject to change withoutnotice. PCB, ICP, Modally Tuned, Spindler, Swiveler and TORKDISC are registered trademarks of PCB Group. SoundTrackLXT, Spark and Blaze are registered trademarks of PCB Piezotronics. SensorLine is a service mark of PCB Group. All othertrademarks are property of their respective owners.

AD-3991-ITAR-0313 Printed in U.S.A.

The Aerospace & Defense division of PCB Piezotronics, serves the Turbine Engine,Helicopter Health and Usage Monitoring (HUMS), Ground Vibration Test, Flight Test,Wind Tunnel Test, Fuze/Safe and Arm, Spacecraft and Aerospace Systems designand development communities with sensors and associated signal conditioning formeasurement of acceleration (vibration, shock and rigid body); acoustics; pressure;force; strain and torque. Sensor technologies employed include piezoelectric,piezoresistive (both strain gage and MEMS) and variable capacitive (both MEMSand microphone). Manufacturing operations are certified to AS9100 and ISO 9001,with calibration procedures accredited by A2LA to ISO 17025. Products can bemanufactured to meet specific aerospace environmental standards, with programdesign requirements to meet RTCA-DO-160 and MIL-STD-810 and low outgassingdesigns available for specific applications.

Visit www.pcb.com to locate your nearest sales office

The Model 482C27 four-channel, benchtop signal conditioner is full-featuredand cost effective. It offers low noise operation and simplicity of use. Eachchannel is selectable between two input types: Bridge/MEMS orICP®/Voltage.

For the bridge inputs, this model offers 0 to 12 VDC unipolar or bipolarexcitation voltage for use with single-ended or differential MEMS and bridgesensors, like load cells and reaction torque sensors. This model featuresincremental gain of x0.1 to x2000, auto zero, auto balance, AC/DC coupling,normalization, and shunt calibration. The bridge inputs are compatible withfull bridge sensors as well as ½ and ¼ bridge sensors, with internalswitchable bridge completion resistors.

For the ICP® inputs, the model offers 0 to 20 mA of constant current excitation,to power ICP® sensors or in-line ICP® charge converters. This model featuresincremental gain of x.1 to x200, normalization and AC/DC coupling.

The base unit of this model is powered from 9 to 18 VDC, however, it issupplied with a universal voltage, AC power adaptor. Optional auto lighteradaptor, Model 488A13, is also available.

As with all PCB® instrumentation, this model is complemented with toll-freeapplication assistance, 24-hour customer service and is backed by a no-riskpolicy that guarantees satisfaction or your money refunded.

MEMS Sensor Signal ConditionerModel Number 482C27

Channels 4

Sensor Input Types Differential/Single-ended MEMS/Bridge, ICP®/Voltage

Compatible Sensor Series 350X, 360X, 371X, 374X, 3991, load cells

Gain x0.1 to x2000; x0.1 to x200 [1]

Gain Increment 0.1

Output Range ±10 V

Frequency Response DC to 100k Hz (-3dB)

Temperature Range (Operating) +32 to +122 °F0 to +50 °C

Excitation Voltage 0 to 12 VDC unipolar or bipolar [2]

Computer Controller Ethernet/RS-232

Power Required 9 to 18 VDC [3]

Input Connectors (4) 8-socket mini DIN, (4) BNC Jacks

Output Connectors BNC Jacks

Size (Height x Width x Depth) 3.2 in x 8.0 in x 5.9 in8.1 cm x 20 cm x 15 cm

Weight 2.25 lb1.021 kg

Supplied Accessories

(1) 017AXX Power Cord; (1) 488A14 Universal Power Adaptor; (1) MCSC Control Software

Additional Accessories s

Auto Lighter Adaptor 488A13

Input Mating Connector(s) 8-pin mini DIN, AC

Additional Versions

8-channel 19" rack mount version, computer control only 483C28

Notes

[1] Maximum gain for bridge/MEMS input is x2000 and for ICP®/voltage input is x200.[2] In bipolar mode, +Vexc and -Vexc track each other. They are equal and opposite. [3] Supplied with 85 to 264 VAC, 47 to 400 Hz Universal Power Adaptor.

483C288-channel version, computer control only

Typical Rear Panel